Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1543659
MD5: 20840d7c50e706f3e9a697cb3550bfdc
SHA1: d36d5e8b423d99b97dc5cbb160327fbb44953bc9
SHA256: bcccde65dbc346f190fff539a4ac2b0e9c194e544a901d098910082c72c5448b
Tags: elfuser-abuse_ch
Infos:

Detection

Gafgyt, Mirai
Score: 100
Range: 0 - 100
Whitelisted: false

Signatures

Antivirus / Scanner detection for submitted sample
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Suricata IDS alerts for network traffic
Yara detected Gafgyt
Yara detected Mirai
Opens /proc/net/* files useful for finding connected devices and routers
Detected TCP or UDP traffic on non-standard ports
Sample and/or dropped files contains symbols with suspicious names
Sample contains strings that are user agent strings indicative of HTTP manipulation
Uses the "uname" system call to query kernel version information (possible evasion)
Yara signature match

Classification

Name Description Attribution Blogpost URLs Link
Bashlite, Gafgyt Bashlite is a malware family which infects Linux systems in order to launch distributed denial-of-service attacks (DDoS). Originally it was also known under the name Bashdoor, but this term now refers to the exploit method used by the malware. It has been used to launch attacks of up to 400 Gbps. No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/elf.bashlite
Name Description Attribution Blogpost URLs Link
Mirai Mirai is one of the first significant botnets targeting exposed networking devices running Linux. Found in August 2016 by MalwareMustDie, its name means "future" in Japanese. Nowadays it targets a wide range of networked embedded devices such as IP cameras, home routers (many vendors involved), and other IoT devices. Since the source code was published on "Hack Forums" many variants of the Mirai family appeared, infecting mostly home networks all around the world. No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/elf.mirai

AV Detection
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Antivirus / Scanner detection for submitted sample
Source: na.elf Avira: detected
Found malware configuration
Source: na.elf Malware Configuration Extractor: Gafgyt {"C2 url": "93.123.85.205:7777"}
Multi AV Scanner detection for submitted file
Source: na.elf ReversingLabs: Detection: 65%

Spreading
barindex
Opens /proc/net/* files useful for finding connected devices and routers
Source: /tmp/na.elf (PID: 5549) Opens: /proc/net/route Jump to behavior

Networking
barindex
Suricata IDS alerts for network traffic
Source: Network traffic Suricata IDS: 2846526 - Severity 1 - ETPRO MALWARE ELF/BASHLITE Variant CnC Checkin : 192.168.2.15:38680 -> 93.123.85.205:7777
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.15:38680 -> 93.123.85.205:7777
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: unknown TCP traffic detected without corresponding DNS query: 93.123.85.205
Source: global traffic DNS traffic detected: DNS query: daisy.ubuntu.com

System Summary
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Malicious sample detected (through community Yara rule)
Source: na.elf, type: SAMPLE Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 5551.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 5549.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: na.elf PID: 5549, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: na.elf PID: 5551, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Sample and/or dropped files contains symbols with suspicious names
Source: na.elf ELF static info symbol of initial sample: __gnu_unwind_execute
Yara signature match
Source: na.elf, type: SAMPLE Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: 5551.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: 5549.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: Process Memory Space: na.elf PID: 5549, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: Process Memory Space: na.elf PID: 5551, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: classification engine Classification label: mal100.spre.troj.linELF@0/0@2/0
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/na.elf (PID: 5549) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 5549.1.000055e3603b4000.000055e3604e2000.rw-.sdmp, na.elf, 5551.1.000055e3603b4000.000055e3604e2000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/arm
Source: na.elf, 5549.1.00007fffb9141000.00007fffb9162000.rw-.sdmp, na.elf, 5551.1.00007fffb9141000.00007fffb9162000.rw-.sdmp Binary or memory string: OXx86_64/usr/bin/qemu-arm/tmp/na.elfSUDO_USER=saturninoPATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/binDISPLAY=:1.0XAUTHORITY=/run/user/1000/gdm/XauthoritySUDO_UID=1000TERM=xterm-256colorCOLORTERM=truecolorLOGNAME=rootUSER=rootLANG=en_US.UTF-8SUDO_COMMAND=/bin/bashHOME=/rootMAIL=/var/mail/rootSUDO_GID=1000SHELL=/bin/bash/tmp/na.elf
Source: na.elf, 5549.1.000055e3603b4000.000055e3604e2000.rw-.sdmp, na.elf, 5551.1.000055e3603b4000.000055e3604e2000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: na.elf, 5549.1.00007fffb9141000.00007fffb9162000.rw-.sdmp, na.elf, 5551.1.00007fffb9141000.00007fffb9162000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm

Stealing of Sensitive Information
barindex
Yara detected Gafgyt
Source: Yara match File source: na.elf, type: SAMPLE
Yara detected Mirai
Source: Yara match File source: na.elf, type: SAMPLE
Source: Yara match File source: 5551.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY
Source: Yara match File source: 5549.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: na.elf PID: 5549, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: na.elf PID: 5551, type: MEMORYSTR
Sample contains strings that are user agent strings indicative of HTTP manipulation
Source: Initial sample User agent string found: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36
Source: Initial sample User agent string found: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36
Source: Initial sample User agent string found: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36
Source: Initial sample User agent string found: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.71 Safari/537.36
Source: Initial sample User agent string found: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Source: Initial sample User agent string found: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36
Source: Initial sample User agent string found: Mozilla/5.0 (Windows NT 5.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36

Remote Access Functionality
barindex
Yara detected Gafgyt
Source: Yara match File source: na.elf, type: SAMPLE
Yara detected Mirai
Source: Yara match File source: na.elf, type: SAMPLE
Source: Yara match File source: 5551.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY
Source: Yara match File source: 5549.1.00007fc9a0017000.00007fc9a002f000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: na.elf PID: 5549, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: na.elf PID: 5551, type: MEMORYSTR

No Screenshots

  • No. of IPs < 25%
  • 25% < No. of IPs < 50%
  • 50% < No. of IPs < 75%
  • 75% < No. of IPs

Contacted Public IPs

IP Domain Country Flag ASN ASN Name Malicious
93.123.85.205
 unknown Bulgaria
43561 NET1-ASBG true

Contacted Domains

Name IP Active
daisy.ubuntu.com 162.213.35.24 true

Contacted URLs

Name Malicious Antivirus Detection Reputation
93.123.85.205:7777 true
    		unknown